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Circuit device for deviation compensation

An offset compensation, line technology, applied to the components of the amplifier, logic circuits, DC-coupled DC amplifiers, etc., can solve problems such as limitations, bad transition state duration, inaccuracy, etc.

Inactive Publication Date: 2003-09-03
INFINEON TECH AG
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

But what is often required is that offset compensation should work as precisely as possible near the limits of the op amp's operating range, and be severely limited beyond that
Every step further away from this limit will only make the transition state duration worse, while non-linearities near the range bounds will lead to inaccuracies
However, these requirements cannot be met in known line arrangements by means of voltage dividers

Method used

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  • Circuit device for deviation compensation
  • Circuit device for deviation compensation

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Embodiment Construction

[0009] In the circuit arrangement according to the invention for offset compensation shown as an example, the non-inverting input of the comparator 2 is fed with an input signal 1 whose DC component varies continuously and very slowly. In this case, the instantaneous amplitude of the AC component should be determined by means of the comparator 2 , for example greater or less than zero. Based on the superimposed DC component of the input signal 1, the comparison signal fed to the inverting input of the comparator 2 should be set such that its DC component is compensated.

[0010] A low-pass filter 3 is used for compensation, and the input signal 1 is fed into the low-pass filter. The cut-off frequency of the low-pass filter 3 should be selected very low, basically only allowing the DC component to pass. After the low-pass filter 3, a tracking and holding device is connected. In this embodiment, the tracking and holding device consists of a controllable switch 4, a resistor 5 c...

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Abstract

A circuit configuration for offset compensation includes a filter arrangement (3) for determining the common mode value in a supplied input signal (1), and a combination circuit (2) for subtracting the input signal and the output signal of the filter arrangement. A track- and hold- arrangement (4, 5, 6, 7) is connected between the filter arrangement (3) and the combination circuit, which is controllable by a control signal. The control signal is provided by a window-comparator arrangement (9), at whose input the input signal is supplied. The track- and hold- arrangement is in a track-mode when the input signal lies within a predetermined window, and otherwise in the hold-mode.

Description

technical field [0001] The invention relates to a circuit arrangement for offset compensation having a filter device for detecting the DC content of an input signal connected to it and a logic device for subtraction of the input signal and the output signal of the filter device logic operation. Background technique [0002] Such a circuit arrangement is disclosed, for example, in the company publication of Linear Technology Corporation, Linear Applications Handbook (Linear Applications Handbook) 1987, page AN21-1. In the circuit arrangement described in the book, the input signal is fed directly to the inverting input of the operational amplifier on the one hand and, on the other hand, to the non-inverting input of the operational amplifier with a low pass. The low-pass has a relatively low cut-off frequency, mainly to allow only the DC component to reach the non-inverting input of the operational amplifier. Therefore, the DC current operating point of the op amp is adjust...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/30H03F1/32H03F3/34H03K5/08H04L25/03
CPCH03F1/303
Inventor S·维伯V·托马斯
Owner INFINEON TECH AG
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